Enigmatic Jokes

The Enterprise runs into a mysterious energy field of a type that it has
encountered several times before.
The Enterprise goes to check up on a remote outpost of scientists, who
are all perfectly all right.
The Enterprise comes across a Garden-of-Eden-like planet called Paradise,
where everyone is happy all the time. However, everything is soon revealed
to be exactly as it seems.
The crew of the Enterprise discover a totally new lifeform, which later
turns out to be a rather well-known old lifeform, wearing a silly hat.
The crew of the Enterprise are struck by a strange alien plague, for
which the cure is found in the well-stocked sick-bay.
An enigmatic being composed of pure energy attempts to interface to
the Enterprise's computer, only to find out that it has forgotten to
bring the right leads.
A power surge on the Bridge is rapidly and correctly diagnosed as a
faulty capacitor by the highly-trained and competent more...